Hi all,
I have used GetOpt in Python and Ocaml so I am reasonably familiar
with it, and I have been studying the technique here:
http://www.haskell.org/haskellwiki/High-level_option_handling_with_GetOpt
Can anyone explain to me what is actually happening here:
opts <- foldl (>>=) (return startOptions) actions
let Options { optVerbose = verbose
, optInput = input
, optOutput = output } = opts
input >>= output
I understand the fold is evaluating everything in the actions list
overlaying them onto the startOptions record, then getting these out
of IO and into the opts record - but where are "verbose", "input" and
"output" coming from? Are they just aliases?
Any insight gratefully received :-)
Thanks,
G
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